Before you start adding tunes randomly because they're listed as public domain, read this first:
Public Domain Info
Just because a composition is P.D., the recording of it is not. You can buy CDs of tracks recorded for sole purpose of using in movies (the artist are already prepaid for it), but the discs themselves will run into the hundreds of dollars easily. Your best bet is to find unsigned bands or composers online. Many of them would gladly let you use music for a credit and copy of the finished movie. I've done it plenty of times myself.
As for the camera, I couldn't tell you. I've only shot on a Sony once before and it was night time out. To me, they all look the same under streetlights.
Good luck.
CK